EP0886435A2 - Method and apparatus for half-toning of images in a printer - Google Patents
Method and apparatus for half-toning of images in a printer Download PDFInfo
- Publication number
- EP0886435A2 EP0886435A2 EP98105566A EP98105566A EP0886435A2 EP 0886435 A2 EP0886435 A2 EP 0886435A2 EP 98105566 A EP98105566 A EP 98105566A EP 98105566 A EP98105566 A EP 98105566A EP 0886435 A2 EP0886435 A2 EP 0886435A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- halftone
- image
- data
- raster
- printer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 80
- 238000009877 rendering Methods 0.000 claims abstract description 8
- 239000011159 matrix material Substances 0.000 claims description 22
- 238000013139 quantization Methods 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 description 17
- 238000012937 correction Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 7
- 230000006837 decompression Effects 0.000 description 4
- 238000007639 printing Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000013144 data compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
- G06K2215/0002—Handling the output data
- G06K2215/0005—Accepting output data; Preparing data for the controlling system
- G06K2215/0014—Transforming the printer input data into internal codes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
- G06K2215/0002—Handling the output data
- G06K2215/0062—Handling the output data combining generic and host data, e.g. filling a raster
- G06K2215/0065—Page or partial page composition
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
- G06K2215/0082—Architecture adapted for a particular function
- G06K2215/0094—Colour printing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Facsimile Image Signal Circuits (AREA)
- Image Processing (AREA)
Abstract
Description
Claims (12)
- A method for halftoning of images to be rendered onto a media sheet, said method comprising the steps of:a) classifying data portions of a received data stream into one of plural types, each type to be subjected to one of plural halftone procedures;b) assigning to each data portion of a common type, a common identifier;c) converting said data portions into a raster representation comprising data segments that correspond to said data portions;d) selectively subjecting said raster representation to said plural halftone procedures, each data segment of said raster representation that is associated with a common identifier subjected to an identical halftone procedure; ande) rendering said raster representation to a media sheet, after said representation is subjected to said halftone procedures.
- The method as recited in claim 1, wherein step a) classifies each said data portion as belonging to a common image type, including; text, raster image or graphics.
- The method as recited in claim 1 wherein step b) assigns to each data segment comprising a data portion, a multi-bit value as said common identifier.
- The method as recited in claim 3, wherein each data segment comprises a multi-bit value indicative of a color or intensity of a pixel of an image.
- The method as recited in claim 4, wherein step d) subjects each said multi-bit value to a quantization procedure in accord with a number of available printer intensity values and then subjects each quantized multi-bit value to one of said plural halftone procedures in accord with the associated common identifier.
- The method as recited in claim 5, wherein each said halftone procedure provides to a common type data segment, either enhanced intensity with a reduction in resolution, a best available resolution with a reduction in intensity, or an improvement in either a level of intensity or resolution, at the cost of the other.
- The method as recited in claim 1, wherein step c) carries forward said common identifiers in association with said data segments.
- A printer (12) with means for halftoning of images to be rendered onto a media sheet, said printer (12) comprising:image type identification means (12) for classifying data portions of a received data stream into one of plural image types, each image type to be subjected to a selected one of plural halftone procedures and for assigning to each data portion of a common image type, a common identifier;raster operation means (16) for converting said data portions into a raster representation comprising data segments that correspond to said data portions;selective halftone means (26) for subjecting said raster representation to plural halftone procedures, each data segment of said raster representation that is associated with a common identifier subjected to an identical halftone procedure; andprint engine means (28) for rendering said raster representation to a media sheet, after said raster representation is subjected to said halftone procedures.
- The printer (12) as recited in claim 8, wherein said image type identification means (14) classifies each said data portion as belonging to a common image type, including; text, raster image or graphics.
- The printer (12) as recited in claim 8, wherein said input data segments are multi-bit color values and said selective halftone means (26) subjects said color values to a quantization procedure so as to adjust said color values to be compatible with said printer means, and further comprises;plural threshold matrix means (40,42,44) manifesting threshold values for comparison with color values that have been adjusted, to accomplish a spatial dithering thereof.
- The printer as recited in claim 10, wherein each of said plural threshold matrix means (40,42,44) manifests a threshold matrix that is unique to a halftone procedure, and said plural threshold matrix means (40,42,44) maintaining each said threshold matrix in random access memory so as to be user-alterable.
- The printer as recited in claim 8, wherein said raster halftone means causes (26) said common identifiers to be carried forward in association with said data segments.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US877343 | 1997-06-17 | ||
US08/877,343 US5949964A (en) | 1997-06-17 | 1997-06-17 | Method and apparatus for halftoning of images in a printer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0886435A2 true EP0886435A2 (en) | 1998-12-23 |
EP0886435A3 EP0886435A3 (en) | 2000-08-02 |
Family
ID=25369789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98105566A Withdrawn EP0886435A3 (en) | 1997-06-17 | 1998-03-26 | Method and apparatus for half-toning of images in a printer |
Country Status (3)
Country | Link |
---|---|
US (1) | US5949964A (en) |
EP (1) | EP0886435A3 (en) |
JP (1) | JPH1115966A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0999522A2 (en) * | 1998-11-06 | 2000-05-10 | Canon Kabushiki Kaisha | Image processing method, system and apparatus, and storage medium |
US6449328B1 (en) | 2000-05-15 | 2002-09-10 | International Business Machines Corporation | Method and apparatus for shifting data from registers |
EP1251684A1 (en) * | 2001-04-20 | 2002-10-23 | Ricoh Company, Ltd. | Apparatus for forming images with proper gamma correction |
EP1293934A2 (en) * | 2001-09-12 | 2003-03-19 | Seiko Epson Corporation | Color processing architecture and algorithms for color laser printers |
US6721456B1 (en) | 2000-02-23 | 2004-04-13 | International Business Machines Corporation | Color image data and control bit compression scheme with run length encoding |
US6804411B1 (en) | 2000-05-15 | 2004-10-12 | International Business Machines Corporation | Method, system, and program for decompressing and aligning line work data from multiple objects |
US6850338B1 (en) | 2000-05-12 | 2005-02-01 | International Business Machines Corporation | Method, system, program, and data structure for generating raster objects |
US6894796B1 (en) | 2000-05-12 | 2005-05-17 | International Business Machines Corporation | Method, system, and logic for selecting line work and control data for a pixel from multiple objects of line work data provided for the pixel |
US6961134B1 (en) | 2000-05-15 | 2005-11-01 | International Business Machines Corporation | Method, system, and logic using multiplexers to select data for pixels from multiple objects |
US7394568B1 (en) | 2000-05-15 | 2008-07-01 | Infoprint Solutions Company Llc | Method, system, and logic for selecting pixel data from multiple objects |
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US7437483B1 (en) * | 1999-03-24 | 2008-10-14 | Microsoft Corporation | System and method for transferring a compressed data file to a peripheral device |
AUPP996099A0 (en) | 1999-04-23 | 1999-05-20 | Silverbrook Research Pty Ltd | A method and apparatus(sprint01) |
DE19919624C2 (en) * | 1999-04-29 | 2001-03-01 | Oce Printing Systems Gmbh | Method, system and computer program for compressing and transmitting raster image data |
JP2001310520A (en) * | 2000-04-27 | 2001-11-06 | Canon Inc | Method and apparatus of image processing and storage medium |
JP2001320584A (en) * | 2000-05-08 | 2001-11-16 | Ricoh Co Ltd | Image processor and image forming device |
US6900908B1 (en) * | 2000-09-20 | 2005-05-31 | International Business Machines Corporation | Method, system, and program for halftoning data for rendering in a multitone output device |
US6870645B1 (en) | 2000-10-03 | 2005-03-22 | Hewlett-Packard Development Company, L.P. | Plane dependent matrix based halftoning |
US6832007B1 (en) * | 2000-11-21 | 2004-12-14 | Xerox Corporation | Method and system for compensating for scaling artifacts in mixed raster content (MRC) representations |
US6967753B2 (en) * | 2001-07-31 | 2005-11-22 | Hewlett-Packard Development Company, L.P. | Plane dependent compression |
US7355747B2 (en) * | 2002-01-18 | 2008-04-08 | Hewlett-Packard Development Company, L.P. | System for improving the speed of data processing |
AU2003201329B2 (en) * | 2002-03-25 | 2005-10-20 | Canon Kabushiki Kaisha | A System and Method for Optimising Halftoning Printer Performance |
AUPS134202A0 (en) * | 2002-03-25 | 2002-05-09 | Canon Kabushiki Kaisha | System and method for optimizing halftoning printer performance |
US7345792B2 (en) * | 2002-12-17 | 2008-03-18 | Xerox Corporation | Segmentation-based halftoning |
US7079687B2 (en) * | 2003-03-06 | 2006-07-18 | Seiko Epson Corporation | Method and apparatus for segmentation of compound documents |
JP4285127B2 (en) * | 2003-07-30 | 2009-06-24 | セイコーエプソン株式会社 | Color reduction processing apparatus and color reduction processing method |
US8184305B2 (en) * | 2003-09-05 | 2012-05-22 | Sharp Laboratories Of America, Inc. | PDF image-only dedicated print-flow pipeline structure and processing |
GB0321164D0 (en) * | 2003-09-10 | 2003-10-08 | Hewlett Packard Development Co | Methods,apparatus and software for printing location pattern |
US7302107B2 (en) * | 2003-12-23 | 2007-11-27 | Lexmark International, Inc. | JPEG encoding for document images using pixel classification |
US7450270B2 (en) * | 2004-01-16 | 2008-11-11 | Hewlett-Packard Development Company, L.P. | Image data processing methods, hard imaging devices, and articles of manufacture |
US7616349B2 (en) | 2004-02-27 | 2009-11-10 | Lexmark International, Inc. | Font sharpening for image output device |
US20050219278A1 (en) * | 2004-03-30 | 2005-10-06 | Hudson Kevin R | Image formation with a flexible number of passes |
US7168784B2 (en) * | 2004-03-30 | 2007-01-30 | Hewlett-Packard Development Company, L.P. | Formation of images |
KR100611981B1 (en) * | 2004-05-01 | 2006-08-11 | 삼성전자주식회사 | Method and apparatus for halftoning digital images |
GB2415565B (en) * | 2004-06-24 | 2007-10-31 | Hewlett Packard Development Co | Image processing |
US7574055B2 (en) * | 2004-09-07 | 2009-08-11 | Lexmark International, Inc. | Encoding documents using pixel classification-based preprocessing and JPEG encoding |
US7733532B2 (en) * | 2004-10-27 | 2010-06-08 | Marvell International Technology Ltd. | Laser print apparatus with dual halftones |
KR100661351B1 (en) * | 2005-01-17 | 2006-12-27 | 삼성전자주식회사 | Halftone processing apparatus and method |
US7505176B2 (en) * | 2005-03-17 | 2009-03-17 | Kabushiki Kaisha Toshiba | Image processing apparatus |
US20070115506A1 (en) * | 2005-07-11 | 2007-05-24 | Seiko Epson Corporation | Image processing apparatus |
JP4609255B2 (en) * | 2005-09-14 | 2011-01-12 | 富士ゼロックス株式会社 | Image forming apparatus and image processing method thereof |
US8406523B1 (en) | 2005-12-07 | 2013-03-26 | Mcafee, Inc. | System, method and computer program product for detecting unwanted data using a rendered format |
JP4707636B2 (en) * | 2006-09-26 | 2011-06-22 | 大日本スクリーン製造株式会社 | Image recording method and image recording apparatus |
US8228561B2 (en) * | 2007-03-30 | 2012-07-24 | Xerox Corporation | Method and system for selective bitmap edge smoothing |
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US7777760B2 (en) * | 2007-06-29 | 2010-08-17 | Apple Inc. | Display color correcting system |
US8180152B1 (en) * | 2008-04-14 | 2012-05-15 | Mcafee, Inc. | System, method, and computer program product for determining whether text within an image includes unwanted data, utilizing a matrix |
US8368959B2 (en) * | 2009-05-18 | 2013-02-05 | Xerox Corporation | Method and system for selective smoothing of halftoned objects using bitmap encoding |
JP2012114510A (en) * | 2010-11-19 | 2012-06-14 | Kyocera Mita Corp | Image forming apparatus and image forming method |
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US9135532B2 (en) | 2011-10-07 | 2015-09-15 | Hewlett-Packard Development Company, L.P. | Processing image data strips |
US9196000B2 (en) | 2012-03-06 | 2015-11-24 | Xerox Corporation | Method and system for managing distribution of digital rights and revenue for integrated systems |
EP2963908B1 (en) * | 2014-07-01 | 2020-10-28 | Canon Kabushiki Kaisha | Image processing apparatus, image processing method and storage medium |
CN107250972B (en) | 2015-04-24 | 2020-07-03 | 惠普发展公司,有限责任合伙企业 | Determining halftone mechanisms for 3D printing |
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IT202200000365A1 (en) | 2022-01-12 | 2023-07-12 | Itelyum Regeneration S P A | PROCEDURE FOR DISPOSAL OF TIRES |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4496989A (en) * | 1981-07-16 | 1985-01-29 | Dainippon Screen Seizo Kabushiki Kaisha | Method for composing and recording a picture and a character by using picture signals and character signals for use in a picture reproducing machine |
EP0559318A2 (en) * | 1992-03-05 | 1993-09-08 | Adobe Systems Inc. | Graphics co-processor |
US5301271A (en) * | 1991-07-11 | 1994-04-05 | Matsushita Electric Industrial Co., Ltd. | Image processing separately processing two-density-level image data and multi-level image data |
EP0665677A2 (en) * | 1994-01-27 | 1995-08-02 | Hewlett-Packard Company | Printing system |
US5542031A (en) * | 1993-04-30 | 1996-07-30 | Douglass; Clay S. | Halftone computer imager |
US5689344A (en) * | 1996-04-29 | 1997-11-18 | Xerox Corporation | Mitigation of tenting deletions in color xerographic printers |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5337160A (en) * | 1992-07-01 | 1994-08-09 | Hewlett-Packard | Error diffusion processor and method for converting a grey scale pixel image to a binary value pixel image |
US5704021A (en) * | 1994-01-27 | 1997-12-30 | Hewlett-Packard Company | Adaptive color rendering by an inkjet printer based on object type |
-
1997
- 1997-06-17 US US08/877,343 patent/US5949964A/en not_active Expired - Lifetime
-
1998
- 1998-03-26 EP EP98105566A patent/EP0886435A3/en not_active Withdrawn
- 1998-06-11 JP JP10163653A patent/JPH1115966A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4496989A (en) * | 1981-07-16 | 1985-01-29 | Dainippon Screen Seizo Kabushiki Kaisha | Method for composing and recording a picture and a character by using picture signals and character signals for use in a picture reproducing machine |
US5301271A (en) * | 1991-07-11 | 1994-04-05 | Matsushita Electric Industrial Co., Ltd. | Image processing separately processing two-density-level image data and multi-level image data |
EP0559318A2 (en) * | 1992-03-05 | 1993-09-08 | Adobe Systems Inc. | Graphics co-processor |
US5542031A (en) * | 1993-04-30 | 1996-07-30 | Douglass; Clay S. | Halftone computer imager |
EP0665677A2 (en) * | 1994-01-27 | 1995-08-02 | Hewlett-Packard Company | Printing system |
US5689344A (en) * | 1996-04-29 | 1997-11-18 | Xerox Corporation | Mitigation of tenting deletions in color xerographic printers |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0999522A3 (en) * | 1998-11-06 | 2002-08-14 | Canon Kabushiki Kaisha | Image processing method, system and apparatus, and storage medium |
US7505174B2 (en) | 1998-11-06 | 2009-03-17 | Canon Kabushiki Kaisha | Image processing method, system and apparatus, and storage medium |
US7164493B1 (en) | 1998-11-06 | 2007-01-16 | Canon Kabushiki Kaisha | Image processing method, system and apparatus, and storage medium |
EP0999522A2 (en) * | 1998-11-06 | 2000-05-10 | Canon Kabushiki Kaisha | Image processing method, system and apparatus, and storage medium |
US6721456B1 (en) | 2000-02-23 | 2004-04-13 | International Business Machines Corporation | Color image data and control bit compression scheme with run length encoding |
US6850338B1 (en) | 2000-05-12 | 2005-02-01 | International Business Machines Corporation | Method, system, program, and data structure for generating raster objects |
US6894796B1 (en) | 2000-05-12 | 2005-05-17 | International Business Machines Corporation | Method, system, and logic for selecting line work and control data for a pixel from multiple objects of line work data provided for the pixel |
US6961134B1 (en) | 2000-05-15 | 2005-11-01 | International Business Machines Corporation | Method, system, and logic using multiplexers to select data for pixels from multiple objects |
US6449328B1 (en) | 2000-05-15 | 2002-09-10 | International Business Machines Corporation | Method and apparatus for shifting data from registers |
US7394568B1 (en) | 2000-05-15 | 2008-07-01 | Infoprint Solutions Company Llc | Method, system, and logic for selecting pixel data from multiple objects |
US6804411B1 (en) | 2000-05-15 | 2004-10-12 | International Business Machines Corporation | Method, system, and program for decompressing and aligning line work data from multiple objects |
US7161712B2 (en) | 2001-04-20 | 2007-01-09 | Ricoh Company, Ltd. | Apparatus for forming images with proper gamma correction |
EP1251684A1 (en) * | 2001-04-20 | 2002-10-23 | Ricoh Company, Ltd. | Apparatus for forming images with proper gamma correction |
US6765695B2 (en) | 2001-09-12 | 2004-07-20 | Seiko Epson Corporation | Color processing architecture and algorithms for color laser printers |
EP1293934A3 (en) * | 2001-09-12 | 2003-07-23 | Seiko Epson Corporation | Color processing architecture and algorithms for color laser printers |
EP1293934A2 (en) * | 2001-09-12 | 2003-03-19 | Seiko Epson Corporation | Color processing architecture and algorithms for color laser printers |
Also Published As
Publication number | Publication date |
---|---|
JPH1115966A (en) | 1999-01-22 |
US5949964A (en) | 1999-09-07 |
EP0886435A3 (en) | 2000-08-02 |
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